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  • Room temperature production of graphene oxide with thermally labile oxygen functional groups for improved lithium ion battery fabrication and performance

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    Author(s)
    Qin, Jiadong
    Zhang, Yubai
    Lowe, Sean E
    Jiang, Lixue
    Ling, Han Yeu
    Shi, Ge
    Liu, Porun
    Zhang, Shanqing
    Zhong, Yu Lin
    Zhao, Huijun
    Griffith University Author(s)
    Zhao, Huijun
    Lowe, Sean
    Jiang, Lixue
    Ling, Michael
    Liu, Porun
    Zhang, Shanqing
    Zhong, Yulin
    Qin, Jiadong
    Zhang, Yubai
    Shi, Ge
    Year published
    2019
    Metadata
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    Abstract
    Graphene oxide (GO) has drawn intense research interest over the past decade, contributing to remarkable progress in its relevant applications. The chemical production of GO, however, is challenged by destructive and slowly propagating oxidation, especially for large flake graphite. Herein, we report a simple but effective method to produce well-oxidized and less defective GO by chemically oxidizing commercially available expandable graphite at room temperature (25 °C). Compared to natural graphite with similar flake sizes, expandable graphite afforded faster complete oxidation under the same oxidizing conditions. In addition, ...
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    Graphene oxide (GO) has drawn intense research interest over the past decade, contributing to remarkable progress in its relevant applications. The chemical production of GO, however, is challenged by destructive and slowly propagating oxidation, especially for large flake graphite. Herein, we report a simple but effective method to produce well-oxidized and less defective GO by chemically oxidizing commercially available expandable graphite at room temperature (25 °C). Compared to natural graphite with similar flake sizes, expandable graphite afforded faster complete oxidation under the same oxidizing conditions. In addition, chemical oxidation at room temperature, relative to that at higher temperatures (35 and 45 °C), resulted in a reduced defect concentration in GO. Furthermore, the GO derived from the oxidation of expandable graphite at room temperature exhibited superior electrical conductivity after mild thermal treatment at 150 °C. Considering the energy-saving in both GO synthesis and reduction, the low temperature GO conversion process can be easily integrated into many other electroconductive applications. As a proof of concept, we achieved a good LiFePO4 (without carbon-coating) cathode formulation with our GO, which contributed as a 2D binder (before annealing), and obtained a conductive cathode with improved capacity and high rate performance after mild thermal annealing at 150 °C.
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    Journal Title
    Journal of Materials Chemistry A
    Volume
    7
    Issue
    16
    DOI
    https://doi.org/10.1039/c9ta02244a
    Copyright Statement
    © 2019 Royal Society of Chemistry. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
    Subject
    Macromolecular and Materials Chemistry
    Materials Engineering
    Interdisciplinary Engineering
    Science & Technology
    Physical Sciences
    Technology
    Chemistry, Physical
    Energy & Fuels
    Publication URI
    http://hdl.handle.net/10072/386607
    Collection
    • Journal articles

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